1. Viral hepatitis. At the beginning of the disease, there are more fever, mental fatigue, tiredness, dizziness and headache. The main distinguishing points are long duration of illness, aversion to grease, jaundice, pain in the liver area, increased transaminases can be seen in laboratory tests, if you have a cold and lingering and the above symptoms should be diagnosed and treated early. 2. Influenza. Its main feature is a large number of patients with the same symptoms in the same geographical area in a short period of time, sudden onset of high fever, headache and discomfort, rarely abdominal pain, relatively light respiratory symptoms, conjunctival inflammation is more prominent. It is caused by influenza virus, the main measures to take symptomatic treatment, antiviral, protection of susceptible people, etc.. 3.Mumps. It often appears in the form of the common cold, followed by a sudden high fever that does not subside, along with inflammatory enlargement of the parotid glands and swollen and painful cheeks that lasts 3-5 days. If not treated in time, it can lead to purulent mumps and various complications such as encephalitis, parotitis, acute pancreatitis and nephritis. 4. Epidemic meningitis. Winter and spring, highly contagious, initially more nasal congestion, runny nose, body aches and pains, soon develop into tearing headache, jet-like vomiting, neck ankylosis, corns, etc., red rash all over the body, coma, the sequelae are more serious. 5.Epidemic B encephalitis. Mosquito infectious disease. The main feature is the rapid onset, seasonal, mostly concentrated in July, August, September and the high incidence of children within 10 years of age, the clinical see rapid rise in body temperature, accompanied by headache, vomiting, mental discomfort, and even coma or seizures, a few have limb paralysis, etc., check the peripheral blood and cerebrospinal fluid to help confirm the diagnosis. 6. Measles. Infants and young children are more frequent, the whole body rash and cheek mucosa with measles white spots, 3-5 days that spread throughout the body, high fever 40 ℃ continues not to drop. If there is no abnormality, it will be cured in 2 weeks. On the contrary, it can cause encephalitis, pneumonia and keratitis, etc. The mortality rate is high. 7. Scarlet fever. The main features are high fever, small red papules all over the body, red cheeks, pale around the mouth, and a bright red tongue like strawberry, followed by a flaky rash and healing, which should be distinguished from the flu. 8, tuberculosis. The diagnosis can be confirmed by repeated sputum examination and detection of Mycobacterium tuberculosis. 9.Rheumatic disease. Most often occurs after the common cold, accompanied by a long medical history, and gradually appears wandering joint enlargement pain. If this period is not reasonably treated, it can cause heart valve involvement and then secondary rheumatic heart disease. Special attention should be paid to the possibility of rheumatic fever if red, swollen and hot joints of the extremities occur for unknown reasons after a cold.